I fell 5 weeks ago, resulting in a hematoma just underneath my bum at the top of the hamstring. It has gone down substantially in that time from what was the volume of about a pint glass. However, I have noticed that the whole leg, underneath the hematoma and the calf is a bit tender to the touch. Also occasional joint pain occurs behind the knee of that leg. Could the joint pain be down to the way i have to sit (not putting pressure on the hematoma) And could the initial swelling have moved down the leg to cause the tenderness further down or do these things indicate something more serious? I am 19, male, otherwise healthy.